> Ideally, a SMTP return code should differentiate the reason for rejection. > There should be a different code for non-existing user, technical problems > (like mailbox full) or policy-based reject.
You know, they actually did think of that. https://datatracker.ietf.org/doc/html/rfc5321#section-4.2.3 https://datatracker.ietf.org/doc/html/rfc3463#page-14 > Although I'm not sure if in the > latter case it is possible to differentiate if the policy rejection is > "general" (eg. related to sending IP) or for the particular sender's email > address. Doesn't look like it to me. -- Atro Tossavainen, Chairman of the Board Infinite Mho Oy, Helsinki, Finland tel. +358-44-5000 600, http://www.infinitemho.fi/ _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
